Incandescent lamp



(No Model.)

0. A. MERRITT.

INGANDESCENT LAMP.

, Patented Apr. 9, 1895.

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UNITED STATES PATENT Orrrcn.

CHARLES-ANDREW MERRITT, OF BIRMINGHAM, ALABAMA.

INCANDESCENT LAMP.

SPECIFICATION forming part of Letters Patent No. 537,658, dated April 9, I895.

' Application filed September 17, 1894. Serial No. 523,266-' on model.)

To all whom it may concern:

Be it known that I, CHARLES ANDREW MER- RITT, a citizen of the United States, residing at Birmingham, in the county of Jefferson and State of Alabama, have invented certain new and useful Improvements in Incandescent Lamps; and I do hereby declar'ethe following to be a full, clear, and exact description of the invention, such as will enable others skilled in V the art to which it appertains to make and use the same. 7

My invention relates to improvements in electric incandescent lamps; and the objects of my improvement are, first, to provide an electric incandescent lamp having two or more connecting wires to attach to the carbons by which two or more carbons can be placed in the samelamp; second, to construct an electric incandescent lamp having two or more connecting wires for carbons one end of the wires attached to separate contact posts set in the cement filling of the lamp head the opposite ends of the wires attached to the metallic shell or casing surrounding the filling; third, to provide a switch for an incandescent lamp having two or more wires attached to the carbons one end of the wires attached to separate contact posts the switch 'so constructed as to make a contact to any of the posts singly or to twoor more of the posts at the same timeif so desired. Iattain these objects by the device and arrangement of the wires illustrated in the accompanying drawings, in which 1 Figure 1, is a vertical cross sectional view of my lamp through the center. Fig. 2, is a vertical sectional view through the center of the same at a right angle to Fig. 1'. Fig. 3, is a detail top view before filling the shell of the lamp head, the contact plate and switch left off to show the connections of the wires. Fig. 4, is a top view of the lamp when completed. 7

Similarletters refer to similar parts throughout the several views. p

The glass globe Act the lamp, is of the usual form and make of globes, as now used for electric incandescent lamps. The globe is provided at its upper end with the usual metallic shell or casing B toahold the non con ducting cement filling O forming the lamp head, the globe being attached to the metallic shell by the adhesion of the cement filling in the usual manner.

A glass tube D to inclose the connecting wires to the carbonsis provided. The tube is inclosed in the cement filling of the lamp head in the usual manner. The top end of the tube is provided with a filling E made of cork or other suitable non conducting material. The bottom end of the tube is melted together to inclo'se the tube, and engage the wires in separate series as shown, carbons F being attached to the ends of the wires inside the globe in the usual manner.

The series of positive wires G extend upward through the glass tube and the filling of the same. The wires are bent at right angles above the head of the tube, and the ends of the wires are attachedto a series of metallic contact posts II. The contact posts are made of any suitable metallic material, and the wires are attached to the posts by any of the usual methods. The contact posts are attached to thelamp head, by embedding them in the cement filling A series of negative wires I extend upward through the glass tube and filling. The Wires are bent at right angles above the head of the tube, and attached at the ends to the metallic casing of the lamp head.

baseJ and ahead K is provided. The base of the contact plate is embedded in the insulating filling ofthelamp head. The head is made in the form of a screw and is attached to the base byscrew-threads. The head of the contact plate connects the circuit to the lamp'in the usual manner, by contact from a switch in the lamp socket. The contact plate is provided with an electric switch L formed as shown. The switch is placed between the base and the head of the contactplate, and is journaled to revolve on the screw stem connecting the head oi. the contact plateto the base. The switch is provided on one side with a'finger, to make a connection with any of the contact posts singly, and on the opposite side from the finger, with a plate sufficiently large to cover all the contact posts, by which a contact can be made to two or more of the binding posts, if so desired.

Whenthe lamp is in use, if one of the carbons is burned out, or from any cause gets An electric contact plate consisting of a semoss 1. In an incandescent lamp, the combination of a series of conducting wires to connect to carbons the wires connected-at their upper ends to contact posts embedded in the insulating filling of the lamp head, a contact plate having a base embedded in the insulating filling the contact plate having a headattached to the base by screw-threads, a switch journaled to the contact plate between the head and the base the switch adapted to make an electric connection to one or more of the contact posts as desired, substantially as and for the purpose set forth.

2. In an incandescent lamp, the combination of a series of conducting wires to connect; to carbons the wires connected at their upper ends to contact posts embedded in the insulating filling of the lamp head, aseries of conducting wires from the carbons having their upper ends connected to the metallic casing of the lamp head, an electric contact plate having a base embedded in the insulating filling of the lamp head the contact plate provided with a head attached to the base by screw-threads, a switch journaled to the contact plate the switch provided on one side with a finger to make an electric connection to the contact posts singly and on the opposite side with a plate to make an electric connection with one or more posts as desired, substantially as and for the purpose set forth.

In testimony whereof I a ffix my signature in .presenceof two witnesses.

CHARLES ANDREW MERRI'IT.

WVitnesses:

W. (J. WILL'IAMS, W. H. MANLY. 

